LEONARDTOWN, Md. (WUSA9) -- A woman is charged with second-degree murder after authorities say she injected a man with drugs before he died. She also may be charged in another man's drug-related death from last year.

According to St. Mary's County Sheriff's Office officials, Lena King initially claimed that she discovered John Cleveland suffering from an apparent overdose at Leonardtown Wharf on January 7 before driving him to Medstar St. Mary's Hospital. Cleveland was pronounced dead at the hospital. An autopsy later determined that he died as a result of a heroin overdose which was administered to him by another person.

During an investigation, detectives determined that on January 6, King and Cleveland received prescription drugs from someone in Leonardtown, Md. They say King prepared morphine tablets for injection and injected some into Cleveland's body. Hours later, the two joined another person in Annapolis to purchase heroin. Then, they all returned to a home in Leonardstown. Detectives say King prepared and injected heroin into Cleveland's body.

Detectives tell us that a short time later, it became apparent Cleveland was suffering from an overdose. Lena King had fallen to sleep after ingesting heroin. When she awoke, she discovered Cleveland wasn't breathing and tried to perform CPR on him, say detectives. She couldn't revive him, so King and others placed Cleveland to drive him to the hospital.

After an the investigation, King was charged with Murder-2nd Degree, Involuntary Manslaughter, Reckless Endangerment, Administering Controlled Dangerous Substances (CDS), Distribution of CDS and Possession of CDS.

Authorities say because of this investigation detectives also discovered that Lena King was connected to another drug incident. On October 5th, 2013, deputies from the St. Mary's County Sheriff's Office responded to a parking lot in the Charlotte Hall area for a report of an unconscious person. They found a man dead in the back seat of his vehicle.

According to authorities, the man and Lena Michelle King drove to a location in Prince George's County to purchase heroin and injected it. They were headed back to St. Mary's County when the man suffered a medical emergency and ultimately died as a result of a fatal overdose. When Lena King realized he had died, she left him in his vehicle in the parking lot and called 911. Detectives say before help arrived, King removed items of evidence from the vehicle which included drug paraphernalia and heroin. Additional charges are pending, according to authorities.